That website is geared mostly toward ripping official movies, manipulating sub-titles, breaking encryption, etc. It's really not much help at all for concert video hobbyists.
I would disagree somewhat, while it is definitely geared towards ripping official movies, it's all the same tools, terms, and operations that are needed to do most things with any kind of video. doom9 has been extremely useful to me for finding tools to edit, convert, remux, re-encode all kinds of releases between formats and containers, for example: taking old DVD formats and remuxing to MKV, or other containers that are friendlier to streaming media players or easier for file storage/organization, etc. I would not write off doom9 as an excellent resource for free tools, tutorials, and know-how no matter what kind of video project you have.